Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1991-10-16

1994-03-08

Thibodeau, Paul J.

Stock material or miscellaneous articles

Composite

Of inorganic material

428329, 428694BA, 428694BM, 428900, B32B 516, G11B 566

Patent

active

052925978

ABSTRACT:
A magnetic recording medium having excellent electromagnetic characteristics and well adapted for video use, which comprises a non-magnetic support having provided thereon at least two magnetic layers each comprising a ferromagnetic powder and a binder resin, wherein the uppermost magnetic layer arranged farthest from the support contains a cobalt-containing iron oxide powder having an Fe.sup.2+ /Fe.sup.3+ mole ratio of 20/100 to 50/100 and a coercive force of 650 to 1,500 Oe, and at least one of said magnetic layers is a lower magnetic layer in contact with the uppermost magnetic layer and contains a cobalt-containing iron oxide powder having an Fe.sup.2+ /Fe.sup.3+ mole ratio of less than 20/100 and a coercive force of 0.6 to 1.0 times that of the cobalt-containing iron oxide powder contained in the uppermost magnetic layer.

REFERENCES:
patent: 4200680 (1980-04-01), Sasazawa et al.
patent: 4784895 (1988-11-01), Mizuno et al.
patent: 4851289 (1989-07-01), Ogawa et al.
patent: 4992330 (1991-02-01), Kawahara et al.
patent: 5051303 (1991-09-01), Noguchi et al.

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